Definitions for oceanic abyss
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Princeton's WordNet
trench, deep, oceanic abyss(noun)
a long steep-sided depression in the ocean floor
Wiktionary
oceanic abyss(Noun)
A long, deep depression or trench in the ocean floor
Citation
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"oceanic abyss." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/oceanic abyss>.

